The strip can also be cut off on customer’s requirement,be sure the end of the line must be wrapped by silica gel casing, otherwise it should be cut off.Never connect two wires directly in case of short circuit.Supply voltage of this product is 12-24V ,never connect to AC110V or AC220V.Lead wire should be connected correctly according to colors that connecting diagram offers.Easy installation with the adhesive tape on the back of strip light.The size of item is manual measurement,please allow 0.5-1inch difference.(1inch=2.54cm)Even instruction in the kit, professional installation is High Recommended!